Note 10 - Income Taxes (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Deferred Tax Assets, Valuation Allowance	$ 114,517	$ 99,888
Increase (Decrease) of Net Income Due to Impact of Tax Holidays	$ 1,000	$ 3,800	$ 4,500
Increase (Decrease) of Earning Per Share Due To Impact Of Tax Holidays (in dollars per share)	$ 0.02	$ 0.08	$ 0.09
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 5,200	$ 7,500	$ 5,800
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	500	700
Unrecognized Tax Benefits, Interest Expense, Net of Accrued Interest Reversed	(200)	$ (100)	$ (100)
Maximum [Member]
Unrecognized Tax Benefits, Increase (Decrease) Related to Transfer Pricing	200
Collection Term Range (Year)		10 years
Minimum [Member]
Collection Term Range (Year)		4 years
Domestic Tax Jurisdiction [Member]
Operating Loss Carryforwards	140,300
Tax Credit Carryforward, Amount	3,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	127,800
Tax Credit Carryforward, Amount	35,400
Foreign Tax Jurisdiction [Member]
Operating Loss Carryforwards	$ 1,800